ROBINSON MAINTENANCE MANUAL R22 SERIES

2. Hoist helicopter per § 17-20 approximately one foot above the ground. Have one person hold tail of helicopter while hoisting to stabilize helicopter. 3. With main rotor blades oriented approximately fore and aft, raise both blades off of droop stops to allow hub to teeter freely. Raise tail slightly and allow to settle. 4. Refer to Figure 18-2. With aircraft hanging freely and steady, use a water level and measure difference in vertical height between tail rotor gearbox centerline and cabin belly at vertical firewall. Ensure no air bubbles in water level tube. Record height difference: inches 5. Determine longitudinal center of gravity: 114.47 – [0.315 x (height difference from step 4)] = inches 6. Place a 1000-lb capacity (minimum) scale under each skid. Locate center of scales approximately 10 inches forward of (ground handling wheel ) skid supports. 7. Lower helicopter until it rests entirely on scales. Helicopter must be well balanced on scales before releasing tail. Be sure helicopter is level laterally by placing level on center of aft landing gear cross tube. 8. Determine empty weight: Right scale reading: lb Left scale reading: + lb Tare (leveling shims, hoist fixture, etc.): – lb Empty weight: = lb OCT 2018 Chapter 18 Weight and Balance Page 18.5 ROBINSON MAINTENANCE MANUAL R22 SERIES 18-22 Weighing Procedure and Calculations (continued) 9. Determine CG with full fuel and minimum solo pilot: a. Bladder tank(s): i. With aux tank: (CG from step 5) x (Empty weight from step 8) + 28495 = (Empty weight from step 8) + 303 in. ii. Without aux tank: (CG from step 5) x (Empty weight from step 8) + 22064 = (Empty weight from step 8) + 240 in. b. All-aluminum tank(s): i. With aux tank: (CG from step 5) x (Empty weight from step 8) + 30180 = (Empty weight from step 8) + 319 in. ii. Without aux tank: (CG from step 5) x (Empty weight from step 8) + 23011 = (Empty weight from step 8) + 249 in. 10. If CG from step 9 is aft of aft limit (refer to R22 Pilot’s Operating Handbook [POH] Section 2 for model-specific data), determine required nose ballast: [CG from step 5 – (model’s aft limit)] x (Empty weight from step 8) – 2358 = 64.5 lb 11. Adjust weight and balance to correct for drained unusable fuel and ballast: Item Weight (lb) Longitudinal CG (arm, inches) Moment (in.-lb) Multiply empty weight from step 8 by CG from step 5 x = Nose ballast: x 37.5 = Unusable fuel (add): 10.2*, 6.0**, or 3.6*** x 100.0 = * Bladder tanks ** All-aluminum tank(s) with aux tank *** All-aluminum tank(s) without aux tank Page 18.6 Chapter 18 Weight and Balance OCT 2018 ROBINSON MAINTENANCE MANUAL R22 SERIES 18-22 Weighing Procedure and Calculations (continued) CAUTION CG with full fuel and minimum solo pilot weight must be at or forward of aft CG limit. 12. Determine lateral center of gravity: (Right scale reading – Left scale reading) x 37 = (Right scale reading + Left scale reading) in. 13. Determine lateral moment: (Basic Empty Weight) x (lateral CG)= in.-lb OCT 2018 Chapter 18 Weight and Balance Page 18.7 ROBINSON MAINTENANCE MANUAL R22 SERIES FIGURE 18-3 NOSE BALLAST (View inside lower console assembly with upper console hinged aft) Page 18.8 Chapter 18 Weight and Balance OCT 2018 ROBINSON MAINTENANCE MANUAL R22 SERIES A941-3 Plate (1.00 lb) A941-2 Plate ~ (0.25 lb) A033-20 M ' /?~ • Console 8 / / -~ Assembly = A_ © Calculate weight and CG per§ 1. 232 . Select combination of A941 ballast plates and install per§ 1.240. A363-1 ,/4Cover I ~ ~~ FORWARD f 18-30 Fixed Ballast 18-31 Nose Ballast NOTE Maximum allowable nose ballast is 10.0 lb. CAUTION Changing fixed ballast amount affects helicopter empty weight & center of gravity (CG). If helicopter empty weight & CG historical data is suspect, weigh helicopter per § 18-20. 1. Open or remove console assembly per § 13-70. 2. Refer to Figure 8-3. Remove hardware securing A941-2 or -3 ballast plate(s), if installed, to A363-1 cover. 3. If A941 ballast attach holes are not previously drilled, use A941 ballast as template and mark hole locations. Drill 0.198 inch diameter (#8 drill size) hole at marked locations. 4. Remove or install ballast plates per calculations in § 18-22. Select NAS6603 bolt length to meet torque requirements per § 23-30 Part E. Install hardware, standard torque bolts per § 23-32, and torque stripe per Figure 2-1. 5. Install or close console assembly per § 13-70. Verify security. 6. Reweigh and/or calculate basic empty weight and CG per § 18-22. 7. Revise Weight and Balance Record in R22 Pilot's Operating Handbook (POH) Section 6 to reflect ballast removal or installation using the following data: Item Weight Longitudinal Arm Longitudinal Moment Lateral Arm Lateral Moment Nose ballast 0–10.0 lb 37.5 in. Variable 0.0 in. 0.0 in.-lb JUN 2024 Chapter 18 Weight and Balance Page 18.9 ROBINSON MAINTENANCE MANUAL R22 SERIES Page 18.10 Chapter 18 Weight and Balance JUN 2024 18-32 Empennage Ballast NOTE Approved materials are listed in § 23-70. CAUTION Changing fixed ballast amount affects helicopter empty weight & center of gravity (CG). If helicopter empty weight & CG historical data is suspect, weigh helicopter per § 18-20. A. Removal CAUTION Maximum allowable empennage ballast is 2.00 lb, installed under B902-1 (or -2) mount assembly or A044-1 horizontal stabilizer, as applicable. 1. Leaving NAS6604-44 bolts installed in empennage assembly, remove palnuts, nuts, washers, and A301-5 ballast weight from empennage. 2. Remove one NAS6604-44 bolt and install NAS6604-28 bolt & associated hardware, finger tight. 3. Remove second NAS6604-44 bolt and install NAS6604-28 bolt & associated hardware. Standard torque bolts securing empennage to A148 bulkhead per § 23-32. Install palnuts and standard torque per § 23-32, do not torque stripe at this time. 4. As required, solvent-clean lower surface of empennage assembly around and between attach bolts. Apply light coat zinc-chromate or epoxy primer to noted surface and hardware. Apply topcoat as desired. 5. Apply torque stripe to hardware per Figure 2-1. 6. As required, weigh helicopter or calculate basic empty weight & CG per § 18-20. 7. Revise Weight and Balance Record in R22 Pilot’s Operating Handbook (POH) Section 6 to reflect ballast removal using Table 8-1. ROBINSON MAINTENANCE MANUAL R22 SERIES JUN 2024 Chapter 18 Weight and Balance Page 18.11 18-32 Empennage Ballast (continued) B. Installation CAUTION Maximum allowable empennage ballast is 2.00 lb, installed under B902-1 (or -2) mount assembly or A044-1 horizontal stabilizer, as applicable. 1. Remove empennage assembly per § 4.500. 2. Solvent-clean around and between 0.250 inch diameter holes on lower surface of B902-1 (or -2) mount assembly or A044-1 horizontal stabilizer, as applicable. 3. Temporarily position A301-5 weight on mount assembly or horizontal stabilizer lower surface using two NAS6604-44 bolts & associated hardware finger tight. 4. Trace outline of weight onto mount assembly or horizontal stabilizer lower surface using felt-tip marker or tape. Remove weight. 5. Remove paint within traced outlines on mount assembly or horizontal stabilizer using approved stripper (ref. § 23-71), or by block sanding (to maintain flatness) using 320-grit or finer aluminum-oxide abrasive sandpaper. 6. Remove tracing tape, if installed. Solvent-clean bare metal on mount assembly or horizontal stabilizer & weight clamping surfaces. Conversion coat lower bare metal surface of mount assembly or horizontal stabilizer per § 23-51. 7. Apply approved chromated-epoxy primer (ref. § 23-75) per § 23-60 to bare metal clamping surfaces of weight and mount assembly or horizontal stabilizer. While primer is still wet, install empennage assembly per § 4.500. 8. As required, apply primer and topcoat to exposed hardware. 9. Weigh helicopter or calculate basic empty weight and CG per § 18-20. 10. Revise Weight and Balance Record in R22 Pilot’s Operating Handbook (POH) Section 6 to reflect ballast installation using Table 8-1. Item Weight Longitudinal Arm Longitudinal Moment Lateral Arm Lateral Moment Empennage Ballast 2.0 lb 270.7 in. 541.4 in.-lb 2.6 in. 5.2 in.-lb TABLE 8-1 EMPENNAGE BALLAST WEIGHT AND BALANCE ROBINSON MAINTENANCE MANUAL R22 SERIES Intentionally Blank Page 18.12 Chapter 18 Weight and Balance JUN 2024 ROBINSON MAINTENANCE MANUAL R22 SERIES